I agree with tats she probly has a sore throat from the grass. I know Merlin eats tons of grass just so he can throw up. She probly just has a upset tummy and then made here throat sore. I would just give her water for a day of so. and not let her graze (thats what we call it, eating the grass) Lady does this a lot in her case shes getting rid of hair as she is shedding something awful and she swallows it like a cat.